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in my physics homework I have this question in about voltage. It says "Four point charges equal in magnitude are arranged at the corners of a square as shown in the figure. What is the magnitude of the electric potential at points a, b, and c? I know the answer is that it zero everywhere but I do not understand why, can somebody explain?

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    $\begingroup$ What is the formula for calculating potential due to a point charge? $\endgroup$ – BowlOfRed Feb 9 '17 at 1:00
  • $\begingroup$ ... and use the principle of superposition. $\endgroup$ – sammy gerbil Feb 9 '17 at 1:10
  • $\begingroup$ V=kQ/r, where k is 9*10^9 $\endgroup$ – Tyler6 Feb 9 '17 at 1:10
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Each point a, b, c is equidistant from pairs of equal +ve and -ve charges. In each equidistant pair the potentials due to the +ve and -ve charges have the same magnitude but opposite sign, so their sum is zero.

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